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J. H. PARKINSQN. Air-Compressor.

No. 225,161. V Patented Mar. 2, 1880.

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l BY

ATTORNEYS.

UNITED STATES PATENT OFFICE.

JOHN H. PARKIN SON, OF VIRGINIA CITY, NEVADA, ASSIGNOR OF ONE-THIRD OF HIS RIGHT TO FRANK HINDS, OF SAME PLACE.

AIR-COMPRESSOR.

SPECIFICATION forming part of Letters Patent No. 225,161, dated March 2, 1880.

Application filed July S, 1879. I

To all 'whom 'it may concern:

Beit known that I, JOHN H. PARKINsoN, of Virginia City, in the county of Storey and State of Nevada, have invented a new and Improved Air-Compressor, of which the following is a specication.

lVIyimpI-ovcments relate to air-compressors especially adapted for use at mines; and the object of the invention is to construct a simple Io and durable apparatus, Which will occupy but small space and require but little power to drive it..

The invention consists in combining a cylinder having three valves, a piston, a head, a

I slide, a rotary shaft, and cams, as hereinafter described.

ln the accompanying drawings, Figure l is a front view of the compressor. Fig. 2 is a side view. Fig. 3is avertical section through 2o the cylinder.

Similar letters of reference indicate correspondin g parts.

A is a vertical cylinder, fitted with a piston, a, and head b. The `piston a, passes through the lower head of the cylinder, and is fitted with a cross-head, C, that moves in a slideway formed in the supportingframe d. Upon opposite sides of the head C are bosses or projections'carrying friction-rollers e.

f is a horizontal shaft, driven by power and tted with four cams, g, more or less, that are arranged equidistant around the shaft and two at each side of the cross-head, whereby they act to raise the piston a, alternately.

In the bottom of cylinder A is fitted an elastic cushion, h, that relieves the shock of the piston-head as it falls. In the side of the cylinder just above the cushion is an opening titted at the outside with an outwardly-open- 40 ing spring-valve, ,which permits the air to be driven out from beneath the piston, and the piston is to be fitted air-tight, so that as it rises a vacuum will be formed beneath the head b.

In the upper head of the cylinder is anl opening communicating by a pipe. k, with the re ceiver, .(not showin) which opening is closed by a disk-valve, L This valve l is within a recess formed in the cylinder-head`, to which recess the pipe lc connects, and above the 5o valve is an opening, that is closed by ascrew plug, m, whereby, to obtain access to the valve to renew it, it is only necessary to remove the plug m. The head is also fitted with spring inlet-valve 0, which is of conical form, and is seated in a perforated nut that is tapped into the cylinder-head. One of the inlet-openings is itted with a pipe, p, by which water enters the cylinder for cooling it.

In operation, as the piston is raised by the 6o cams, the air is forced out through the pipe lc, and a vacuum formed beneath the head. As soon as the piston is released it is caused to drop quickly by the pressure caused by the vacuum, the valve o opening to admit the air, 6 5 and at the same time a jet of Water enters from the pipe p, which jet strikes the conical surface of the valve, and is thereby spread over the entire inner surface of the cylinder. A spiral spring may be applied around the pis- 7o ton, as at g, `to aid the fall of the piston.

This compressor is simple, durable, and compact. It saves the expense and space required by air-compressors as heretofore constructed, as well as the time usually occupied in changing the Valve. The only inner valve is in the outlet, and that is readily accessible. Having thus described my invention, I claim as new and desire to secure by Letters Patellt- 8o The improved air-compressor, consisting of the cylinder A, iitted with valves fi Z o, the

piston a, head b, slide O, rotating shaft f, and

cams g, combined for operation substantially as described and shown.

JOHN HENRY PARKIN SON Witnesses:

W. J. Moss, R. B. MITCHELL. 

